The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 23, 2005
Filed:
Feb. 06, 2003
Takashi Sagara, Kadoma, JP;
Toshiharu Takata, Kadoma, JP;
Kiyoaki Ihara, Kadoma, JP;
Hidetaka Kakiuchi, Kadoma, JP;
Kazuo Ishihara, Edogawa-ku, JP;
Chiaki Asano, Edogawa-ku, JP;
Masao Gunji, Edogawa-ku, JP;
Hiroshi Sato, Edogawa-ku, JP;
Takashi Sagara, Kadoma, JP;
Toshiharu Takata, Kadoma, JP;
Kiyoaki Ihara, Kadoma, JP;
Hidetaka Kakiuchi, Kadoma, JP;
Kazuo Ishihara, Edogawa-ku, JP;
Chiaki Asano, Edogawa-ku, JP;
Masao Gunji, Edogawa-ku, JP;
Hiroshi Sato, Edogawa-ku, JP;
Matsushita Electric Works, Ltd., Osaka, JP;
Tohto Kasei Co., Ltd., Tokyo, JP;
Abstract
The present invention features phosphorus containing epoxy resin compositions useful for imparting flame retardant properties to prepregs, resin-clad metal foils, and laminate boards constructed therefrom. The phosphorus containing epoxy resin composition (a) comprises a phosphorus containing epoxy resin (A) and a hardener. The phosphorus containing epoxy resin (A) has an epoxy equivalent of 300-500 g/eq. and comprises the reaction product of a phosphorus containing organic compound (B) and at least one epoxy resin (C). Phosphorus containing compound (B) is the reaction product of organic phosphorus compounds (b) having one active hydrogen atom bonded to a phosphorus atom and a quinone compound, wherein the molar ratio of (b) to quinone is from 1.25:1 to 2:1. This molar excess of (b) yields a phosphorus containing compound (B) that comprises both the reaction product of (b) and quinone, as well as un-reacted (b). Epoxy resin (C) is selected from a group of specific aromatic-containing epoxy resins, and the content of epoxy resin (C) comprises from 20 to 45 wt. % of (A).